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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Modified (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 769 $ 184 $ 1,463  
Total as a % of Loan Class 0.54% 0.12%    
Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   $ 153 1,027  
30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   4 58  
60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 11  
90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   2 55  
Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   25 312  
Unfunded loan commitment        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 32     $ 221
Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 691 $ 152 1,252  
Total as a % of Loan Class 0.95% 0.19%    
Commercial | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   $ 131 890  
Commercial | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 39  
Commercial | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 10  
Commercial | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 33  
Commercial | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   21 280  
Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 183 $ 97 373  
Total as a % of Loan Class 0.42% 0.19%    
Weighted-Average Interest Rate Reduction 4.49% 4.05%    
Weighted-Average Term Extension (in Months) 9 months 9 months    
Weighted-Average Payment Deferral $ 1 $ 1    
Commercial | Commercial and industrial | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   76 223  
Commercial | Commercial and industrial | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 1  
Commercial | Commercial and industrial | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 5  
Commercial | Commercial and industrial | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Commercial | Commercial and industrial | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   21 144  
Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 508 $ 55 879  
Total as a % of Loan Class 1.76% 0.19%    
Weighted-Average Interest Rate Reduction 0.53% 0.00%    
Weighted-Average Term Extension (in Months) 16 months 14 months    
Weighted-Average Payment Deferral $ 1 $ 0    
Commercial | Commercial real estate | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   55 667  
Commercial | Commercial real estate | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 38  
Commercial | Commercial real estate | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 5  
Commercial | Commercial real estate | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 33  
Commercial | Commercial real estate | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 136  
Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 78 $ 32 211  
Total as a % of Loan Class 0.11% 0.04%    
Retail | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   $ 22 137  
Retail | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   4 19  
Retail | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 1  
Retail | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   2 22  
Retail | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   4 32  
Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 46 $ 24 125  
Total as a % of Loan Class 0.15% 0.08%    
Weighted-Average Interest Rate Reduction 2.01% 1.47%    
Weighted-Average Term Extension (in Months) 88 months 44 months    
Weighted-Average Payment Deferral $ 0 $ 0    
Retail | Residential mortgages | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   16 71  
Retail | Residential mortgages | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   4 17  
Retail | Residential mortgages | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Residential mortgages | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   2 22  
Retail | Residential mortgages | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   2 15  
Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 6 $ 3 15  
Total as a % of Loan Class 0.04% 0.02%    
Weighted-Average Interest Rate Reduction 3.16% 2.02%    
Weighted-Average Term Extension (in Months) 88 months 139 months    
Weighted-Average Payment Deferral $ 0 $ 0    
Retail | Home equity | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   1 5  
Retail | Home equity | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Home equity | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Home equity | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Home equity | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   2 10  
Retail | Automobile        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 0 $ 0 0  
Total as a % of Loan Class 0.00% 0.00%    
Weighted-Average Interest Rate Reduction 0.00% 2.76%    
Weighted-Average Term Extension (in Months)   23 months    
Weighted-Average Payment Deferral $ 0 $ 0    
Retail | Automobile | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Automobile | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Automobile | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Automobile | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Automobile | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 21 $ 2 58  
Total as a % of Loan Class 0.18% 0.02%    
Weighted-Average Interest Rate Reduction 4.31% 5.77%    
Weighted-Average Payment Deferral $ 0 $ 0    
Retail | Education | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   2 51  
Retail | Education | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 1  
Retail | Education | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Education | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Education | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 6  
Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 5 $ 3 13  
Total as a % of Loan Class 0.10% 0.06%    
Weighted-Average Interest Rate Reduction 19.80% 17.79%    
Weighted-Average Term Extension (in Months)   22 months    
Weighted-Average Payment Deferral $ 0 $ 0    
Retail | Other retail | Current        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   3 10  
Retail | Other retail | 30-59        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 1  
Retail | Other retail | 60-89        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 1  
Retail | Other retail | 90+        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 0  
Retail | Other retail | Nonaccrual        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis   0 $ 1  
Interest Rate Reduction        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 10 6    
Interest Rate Reduction | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Interest Rate Reduction | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Interest Rate Reduction | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Interest Rate Reduction | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 10 6    
Interest Rate Reduction | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 2    
Interest Rate Reduction | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 0    
Interest Rate Reduction | Retail | Automobile        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Interest Rate Reduction | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 3 1    
Interest Rate Reduction | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 5 3    
Term Extension        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 566 119    
Term Extension | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 528 99    
Term Extension | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 85 44    
Term Extension | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 443 55    
Term Extension | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 38 20    
Term Extension | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 37 19    
Term Extension | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 1    
Term Extension | Retail | Automobile        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Payment Delay        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 112 33    
Payment Delay | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 89 32    
Payment Delay | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 65 32    
Payment Delay | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 24 0    
Payment Delay | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 23 1    
Payment Delay | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 5 0    
Payment Delay | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Payment Delay | Retail | Automobile        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Payment Delay | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 18 1    
Payment Delay | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Principal Forgiveness        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Principal Forgiveness | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Principal Forgiveness | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Principal Forgiveness | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Retail | Automobile        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Amount of Principal Forgiven 0 0    
Principal Forgiveness | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Amount of Principal Forgiven 2 1    
Interest Rate Reduction and Term Extension        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 48 5    
Interest Rate Reduction and Term Extension | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 41 0    
Interest Rate Reduction and Term Extension | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 0    
Interest Rate Reduction and Term Extension | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 40 0    
Interest Rate Reduction and Term Extension | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 7 5    
Interest Rate Reduction and Term Extension | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 3 3    
Interest Rate Reduction and Term Extension | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 4 2    
Interest Rate Reduction and Term Extension | Retail | Automobile        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Interest Rate Reduction and Term Extension | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Interest Rate Reduction and Term Extension | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension and Payment Delay        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 33 21    
Term Extension and Payment Delay | Commercial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 33 21    
Term Extension and Payment Delay | Commercial | Commercial and industrial        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 32 21    
Term Extension and Payment Delay | Commercial | Commercial real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 1 0    
Term Extension and Payment Delay | Retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension and Payment Delay | Retail | Residential mortgages        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension and Payment Delay | Retail | Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension and Payment Delay | Retail | Automobile        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension and Payment Delay | Retail | Education        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis 0 0    
Term Extension and Payment Delay | Retail | Other retail        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Amortized cost basis $ 0 $ 0